Just as Christ was put under the Law to redeem those under the Law, so also did He want to be born of a woman for the sake of those who had also been born of a woman. For although He was free from sin, He received the baptism of repentance in the Jordan River ostensibly to inculcate in others, who are worldly, the need to be cleansed through baptism and be born as sons by a new spiritual adoption. John the Baptist did not by any means comprehend this and he accordingly prohibited Jesus from approaching the baptismal bath, saying, “I should be baptized by You.” Immediately thereafter the sacrament is revealed. “Let it be so now, for it is proper for us to fulfill all righteousness,” lest He who had come to save mankind should neglect human customs.
Jerome, Commentary on Galatians 2.4
Paul starts off writing to the Gentiles as “you” and then adds the Jews when he says “our.” If Paul said that the Gentiles were children of God because they believed in Christ, although they had previously been enemies, there was no doubt that Jewish believers were also children of God, since it is clear they had already been called for a long time. In ancient times they had taken this designation as a metaphor, but afterwards it was confirmed by Christ, since it could not really be true without the Spirit. This is what Paul said to the Romans: The Spirit bears witness with our spirit that we are children of God. In order to prove that we have been adopted by God as His children, God has given His Spirit to us, who reveals the sign of the Father in the children, so that we dare to say what we never would have said in our own weakness and inadequacy, which is Abba, meaning “Father.”
Ambrosiaster, Commentary on Galatians 4




















